RFR: 1563: The method 'CheckRun#updateMergeReadyComment' shouldn't update the comment if the comment has not changed

[Zhao Song]

On Fri, 30 Sep 2022 10:50:25 GMT, Guoxiong Li <gli at openjdk.org> wrote:

> This update action needs to be adjusted too.

Yes, It's my bad, did not read the logic of if condition carefully. Thanks for your correction! I will fix it.

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PR: https://git.openjdk.org/skara/pull/1386